Sunday
December 21, 2014

Posts by henry


Total # Posts: 9,764

math
Tan(90-31) = Y1/31 Tan(59) = Y1/31 = 1.66428 Y1=31 * 1.66428 = 51.6 = Ht. of shorter tower. Y1+Y2 = 51.6 + 31*sin25 = 64.7 m. = Ht. of taller tower.
April 13, 2014

physical science
d = V*t = 800 m. V * 5/2 = 800 V = 320 m/s.
April 13, 2014

science
Momentum = m*V = 20 * 5 = 100 kg-m/s.
April 13, 2014

Physics
C(-1.5,0.5), P(x,y) r^2 = (x+1.5)^2 + (y-0.5)^2 = 3^2 x^2+3x+2.25 + y^2-y+0.25 = 9 x^2+3x + y^2-y = 9-2.25-0.25 = 6.5 x^2+3x=(3/2)^2 + y^2-y+(-1/2)^2 = 6.5 x^2+3x+9/4 + y^2-y+1/4 = 26/4+9/4+1/4 x^2+3x+9/4 + Y^2-y+1/4 = 36/4 Multiply both sides by 4: 4x^2+12x+9 + 4y^2-4y+1 = 36...
April 12, 2014

algebra
Isn't there a sign between 30,000 and 1?
April 12, 2014

maths
KE = 0.5m*V^2 = 1000 J. 0.5*0.0081V^2 = 1000 0.00405V^2 = 1000 V^2 = 246,913 V = 497 m/s.
April 12, 2014

Physics
Vo = 210m/s[70o] Xo = 210*cos70 = 71.82 m/s. Yo = 210*sin70 = 197.3 m/s. 1. h = (Y^2-Yo^2)/2g=(0-197.3^2)/-19.6 = 1986 m.
April 11, 2014

physics
d = 0.5a*t^2 = 6 m. 0.5a*3.3^2 = 6 5.445a = 6 a = 1.102 m/s^2. V^2 = Vo^2 + 2a*d = 0 + 2.204*6 = 13.22 V = 3.64 m/s.
April 10, 2014

math
L = ? W = 8 h = 4 2W*h + 2L*h = 256 mm^2 2(8*4) + 2(L*4) = 256 64 + 8L = 256 8L = 256-64 = 192 L = 24 mm. Vol. = L*W*h = 24 * 8 * 4 = 768 mm^3
April 10, 2014

Math
P = 6 + 6*0.019*42 = 10.8 Billion.
April 10, 2014

Algebra
sqrt(-70)^2 = sqrt(70*(-1))^2 = 70*i^2 = 70 * (-1) = -70
April 9, 2014

physics
V=110km/h = 110,000m/3600s = 30.56 m/s. a=(V-Vo)/t = (30.56-0)/0.005=6111 m/s^2. F = m*a = 0.35 * 6111 = 2139 N.
April 9, 2014

physics
a = (V-Vo)/t = (30-0)/4 = 7.5 m/s^2.
April 9, 2014

physics
d = 53 + 53/5 = 63.6 m. T = d/r = 63.6/5 = 12.72 s.
April 9, 2014

physics
Fs = m*g = 127kg * 9.8N/kg = 1245 N. = Wt. of skier and toboggan. sin A = Y/r = 1.65/2.53 = 0.6522 A = 40.7o Fk = u*mg-u*T*sinA Fk = 1245u - u*148*sin40.7 Fk = 1245u - 96.5u = 1148u 148*cos40.7 - 1148u = m*a = m*0 = 0 1148u = 112.2 u = 0.098
April 9, 2014

Physical sciences
Fc = m*g = 330kg * 9.8N/kg = 3234 N. = wt. of crate. Fp = 3234*sin30 = 1617 N. = Force parallel to the incline. Fe - Fp = m*a Fe - Fp = m*0 = 0 Fe = Fp = 1617 N. = Force exerted.
April 9, 2014

physics
Circumference=pi*2r = 3.14 * 0.53=1.665 m. Va = 33.4m/s * 6.28rad/1.665m=126 rad/s a=(V-Vo)/t = (126-0)/11.6=10.87 rad/s^2.
April 9, 2014

Physics
Correction: Fk = u*Fc-u*Fap*sin27.3 Fk = 0.442*218.54 - 0.442*Fap*sin27.3 Fk = 96.6 - 0.203Fap Fap*cos27.3-(96.6-0.203Fap) = m*a 0.889Fap - 96.6 + 0.203Fap = m*0 1.092Fap = 96.6 Fap = 88.5 N. = Force applied. W = Fap*cos27.3 * d W = 88.5*cos27.3 * 9.3 = 731.3 J.
April 8, 2014

Physics
Fc = m*g = 22.3kg * 9.8N/kg = 218.54 N = Wt. of cart. Fk = u*Fc = 0.442 * 218.54 = 96.6 N. = Force of kinetic friction. Fap*cos27.3-Fk = m*a Fap*cos27.3-96.6 = m*0 = 0 Fap*cos27.3 = 96.6 N. W=Fap*cos27.3 * d = 96.6 * 9.3=898.3 J. Fap = Force applied = Tension in rope.
April 8, 2014

Math
X Tickets @ $75 each. (3500-X) Tickets @ $110 each. 75x + 110(3500-x) = 245,000+0.25*245,000 75x + 385,000-110x = 306,250 -35x = 306,250-385,000 = -78,750 X = 2250 Seats @ $75 each. 3500-x=3500-2250 = 1250 seats @ @110each
April 8, 2014

math
9x^2 * x^3 = 32 x^5 = 32 x^5 = 2^5 x = 2
April 8, 2014

Physict
d = d1(V2/V1)^2 = 15(150/50)^2 = 135 m.
April 8, 2014

math
0.05 * 173,000,000
April 7, 2014

math word problem
See previous post: Mon, 4-7-14, 3:36 PM.
April 7, 2014

math
See previous post.
April 7, 2014

geometry
2. m AB = (5-2)/(2-0) = 3/2. m BC = (0-5)/(3-2) = -5/1 = -5. 3. A'(-4,4), B'(-2,7), C'(1,2). 4. m AB' = (7-4)/(-2+4) = 3/2. m BC' = (2-7)/(1+2) = -5/3
April 7, 2014

Math word problems
L = 15x + 15y L = 15(x + y) x = 5 3/8 Yards y = 3/4 Yard L = Total length x + y = 5 3/8 + 3/4 = 43/8 + 6/8 = 49/8 = 6 1/8 Yards. L=15 * 49/8 = 91.875 Yards = 91 7/8 Yds.
April 7, 2014

physics
KE = m*V^2/2 = 4 * 4^2/2 = 32 Joules.
April 7, 2014

Math
See previous post: Sat, 4-5-14, 10:04 PM.
April 6, 2014

physics
Freq. = 5*10^6rad/s * 1rev/6.28rad = 7.958*10^5 rev/s = 7.958*10^5 Hz. Xl = WL = (6.28*7.958*10^5)*100*10^-6 = 500 Ohms. Xc=1/WC = 1/(6.28*7.958*10^5)*100*10^-12 = 2000 Ohms. Z = R + j(Xl-Xc) = 30 + j(500-2000) = 30 - j1500 = 1500.3Ohms [-88.9o] I = V/Z = 1.0[0o]/1500.3[-88.9...
April 6, 2014

Math
P(t) = 100(1-e^-0.12*3) P(3) = 100(1-0.6977) = 30.23% Fails. 100% - 30.23% = 69.7% Usable.
April 5, 2014

Math
The largest exponent of the variable is 2. Therefore, it is a 2nd degree polynomial.
April 5, 2014

College Physics
F1 = 8.2N[125o] F2 = 6.40N[233.4o] A. Fx = 8.2*cos125 + 6.40*cos233.4 = -8.519 N. B. Fy = 8.2*sin125 + 6.40*sin233.4 = 1.579 N. C. F^2 = -8.519^2 + 1.579^2 = 75.07 F = 8.66 N. D. Tan Ar=Fy/Fx = 1.579/-8.519=-0.18535 Ar = -10.5o = Reference angle. A = -10.5 + 180 = 169.5o = 10....
April 5, 2014

Algebra
C = (B/2)^2 = (9/2)^2 = 81/4.
April 4, 2014

physical science
Yes.
April 4, 2014

Math, Geometry
See previous post: Fri,4-4-14,1:14 AM.
April 4, 2014

Algebra
Use Quadratic Formula: X = (-0.8 +- sqrt(0.64+2.96))/-0.04 = -27.43, and 67.43 X = 67.43 m.
April 4, 2014

math
P = Po(1+r)^n Po = $10,000 r = 8%/100% = 0.08 = APR expressed as a decimal. n = 1comp/yr. * 18yrs. = 18 Compounding periods. Solve for P.
April 4, 2014

Math
Correction: c. % Grade = Slope expressed as a percentage.
April 4, 2014

Math
a. Y/X = Y/2.5 = 0.06 Y/2.5 = 0.06 Y = 0.15 Miles = 792 Ft. b. Y/X = Y/90 = 0.06 Y = 90 * 0.06 = 5.4 Miles = 28,512 Ft. c. % Grade = Slope expressed as a decimal.
April 4, 2014

math
P = Po(1+r)^n Po = $8500 r = (12%/4)/100% = 0.03 = Quarterly % rate expressed as a decimal. n = 1yr * 4comp/yr. = 4 compounding periods. Plug the above values into the given Eq and sole for P.
April 4, 2014

Physics
Va=63rev/min * 6.28rad/rev * 1min/60s= 6.594 rad/s. Angle=0.57 + 6.594rad/s*9.5s=63.21 rad. or 0.4132 rad.
April 3, 2014

percentages/word problem
(3456-1600)/1600
April 3, 2014

percentages/word problem
(30.60-18)/18 = 0.70 = 70%
April 3, 2014

percentages/word problem
C + 0.45C = 79.75 1.45C = 79.75 C = $55.00
April 3, 2014

Physics
Correction: Vo = 460.6 rad/s V = 45 rad/s a = -84.3 rad/s^2
April 3, 2014

Physics
Vo=4401rev/min * 6.28rad/rev * 1min/60s= 460.6 m/s V = 430 * 6.28/60 = 45 m/s. a=(V-Vo)/t = (45-460.6)/4.93=-84.3 m/s^2
April 3, 2014

physics
Depth = V*T = 1530 * 3.65/2 = 2792 m.
April 3, 2014

PHYSICS
V = Vo + g*Tr = 0 14 - 9.8Tr = 0 9.8Tr = 14 Tr = 1.43 s. = Rise time. h = ho + Vo*Tr + 0.5g*Tr^2 hmax = 70 + (14*1.43 -4.9*1.43^2)=80 m. Above gnd. hmax = 0.5g*t^2 = 80 4.9t^2 = 80 t^2 = 16.33 Tf = 4.04 s = Fall time. Tr+Tf = 1.43 + 4.04 = 5.47 s. = Time to strike gnd. V=Vo + ...
April 3, 2014

physics
Incomplete.
April 3, 2014

physics.
The liquid with the highest density will have the largest percentage of its' volume above the water. Find the density of each liquid and compare them.
April 3, 2014

Pre Algebra
(9+3+4+16+11+5+T)/7 = 6. Solve for T.
April 3, 2014

Physics
d = V*t = 1500m/s * 1.5/2 = 1125 m.
April 3, 2014

PHYSICS!!!
T = d/V = 200/7 = 28.57 s.
April 3, 2014

physics
P = F * d/t = mg * d/t P = 66*9.8 * 14/44 Joules/s.
April 3, 2014

Physic
The voltage across a battery is equal to the e m f of the battery only when there is no load on the battery. When a resistive load is connected across the terminals, a portion of the voltage is lost across the internal resistance of the battery.
April 3, 2014

Physics Help
L = V(1/F) + 0 Slope = V. V is a constant. y-intercept = 0
April 3, 2014

physics
All of the parameters change.
April 3, 2014

physics
PE = m*V^2 = 0.164 J. .0508*V^2 = 0.164 V^2 = 3.228 V = 1.80 m/s.
April 2, 2014

Physics
Va=219rev/20s * 6.28rad/rev=68.8 rad/s a=(V-Vo)/t = (68.8-0)/20=3.44 rad/s^2. Circumference=pi*2r = 6.28 * 68=427 cm= 4.27 m. d = 219revs * 4.27m/rev = 935.2 m.
April 2, 2014

Physics -- check answers please
1. My answer is zero, because the car did not move backwards. However, you should get a 2nd opinion. 2. KE = 0.5*m*V^2 = 40 Joules KE = 0.5*5*V^2 = 40 2.5V^2 = 40 V^2 = 16 V = 4 m/s. 3c. 4a. PE + KE = Constant 5. I don't know what you mean by 4 100 J If you mean 400 J. the...
April 2, 2014

business mat
I = Po*(r/360)*t = $15 740(r/360)*59 = 15 43,660r/360 = 15 121.28r = 15 r = 0.1237 = 12.37%/yr.
April 2, 2014

business Math
(115-100)/100 = 0.15 = 15%.
April 2, 2014

Business Math
I = Po*r*t = $1.307 45,000*(0.04/365)*t = 1307 Solve for t in days. NOTE: Exact interest is based on 365 days per year instead of 360 days.
April 2, 2014

Algebra
X = 3y^2 K = Yv = -B/2A = 0/6 = 0 h = Xv = 3 * 0^2 = 0 D(X1,K), V(h,K), F(X2,K). D(X1,0), V(0,0), F(X2,0) DV = 0-X1 = 1/4a = 1/12 0-X1 = 1/12 X1 = -1/12 VF = X2-0 = 1/4a = 1/12 X2 = 1/12
April 2, 2014

physics
a = (Fap-Fk)/m = (160-24)/20 = 6.8 m/s^2
April 1, 2014

physics
V = Vo + a*t = 30 m/s 0 + a*4 = 30 a = 30/4 = 7.5 m/s^2.
April 1, 2014

Math
Can you clarify your problem?
April 1, 2014

Math
(150-73)/150 = 0.51 = 51%
April 1, 2014

science
750W * 1hp/746W = 1.0 hp.
March 31, 2014

math
post it.
March 31, 2014

phisecs
Power = 19kW = 19000W = 19,000 Joules/s. Power = F*V = F * 29 = 19,000 J./s F = 19,000/29 = 655.2 N.
March 31, 2014

phisecs
a = (V^2-V0^2)/2d a = (0-17^2)/40 = - 7.23 m/s^2.
March 31, 2014

algebra
x-1 = x+5 x-x = 5+1 0 = 6. No Solution.
March 30, 2014

Physics
What is the mass of the crate?
March 30, 2014

Physics
V=90mi/h * 1600m/mi * 1h/3600s.= 40 m/s. a = (V-Vo)/t = (40-0)/0.5 = 80 m/s^2.
March 29, 2014

Physics
Work = F*h = mg * h = 6*9.8 * 4=235.2 J. Work = F*h = 12 * 5 = 60 J. Work = 5*8 = 40 J. PE = mg*h = 5 * 8 = 40 J.
March 28, 2014

Physics
L = V/F = 199 m. F = V/199 = 300*10^6/199=1.51*10^6 cy/s= 1.51*10^6 Hz. WL = 1/WC C = 1/W^2*L C=1/(6.28*1.51*10^6)^2*785*10^-6=0.0142 nanofarads.
March 28, 2014

World History
What role did the Jacobins play in the French Revolution? The Jacobins reached an agreement with moderate French leaders to end the revolution. The Jacobins opened French gov't to full participation by women. The Jacobins returned France to a monarchy by supporting ...
March 27, 2014

History
How was James I's rule of England similar to peter the great's rule of Russia? Both reduces the size of their empire. Both increased their own power without approval by other government entitles. Both relied heavily on the opinions of their subjects when making ...
March 27, 2014

Electricity
Q = C*V = 10*10^-9F * 5V = 50*10^-9 Coulombs.
March 27, 2014

math
Got it! thanks
March 26, 2014

math
for the line segment whose endpoints are r(1,2) and s(6,7), find the point located 3/4 the distance from r to s.
March 26, 2014

math 2
Thank you so much reiny : )
March 26, 2014

math 2
A segment with endpoints C (3,4) and D (11,3) is divided by a point E such that CE and DE form a 3:5 ratio. Find E.
March 26, 2014

math
So I continued working where you left off and got y=0.5x+2.5 is that correct? or is it y=0.5x-2.5? I am pretty sure that it is the first one but I just wanna make sure.
March 26, 2014

math
Write an equation of a line perpendicular to line AB below in slope-intercept form that passes through the point (7, 6). A (0,1) B (-2,5)
March 26, 2014

Math
Wow thanks! It is correct! :D
March 26, 2014

Math
Write an equation of a line perpendicular to y=1/2x-5 in slope-intercept form that passes through the point (2, -7).
March 26, 2014

6th Grade Math
Blue = 3/10 Red = 4/10 = 2/5 Green = 3/10
March 26, 2014

Physics
h = Vo*t + 0.5g*t^2 = 2 m. 0 + 4.9*t^2 = 2 t^2 = 0.4082 t = 0.639 s. = Fall time. V = Vo + g*t = g*t. g = 10 m/s^2 Use the following points for graphing. (t,v) = (0,0), (0.2,2), (0.3,3),(0.5,5), (0.6,6).
March 26, 2014

math
P = (Po*r*t)/(1-(1+r)^-t) Po = Initial principal = $199,000 r = (7.01%/12)/100% = 0.00584 = Monthly % rate expressed as a decimal. t = 25yrs * 12mo/yr. = 300 Months. Plug the above values into the given Eq. and get: P = $422,328.10 Int.(Tot.) = P-Po = $223,328.10 Monthly ...
March 26, 2014

Physical science
See Related Questions: Wed,9-25-13,3:20 PM.
March 26, 2014

physics
Ingrid: 2h, 21min, 06s = Blake-: 2h, 06min, 50s = 2h, 20min, 66s 2h, 06min, 50s Diff. = 14min, 16s. = = 14.267min = Blake's winning margin. Tb = 120 + 6 + 50/60 = 126.833min = Blake's time. Vb = d/Tb = 42,195m/126.833min = 332.681 m/min = Blake's speed. d = 332....
March 25, 2014

physics
See Related Questions: Fri,3-21-14,8:55 PM.
March 24, 2014

Physics
m*g = 115 * 9.8 = 1127 N. = Wt. of box. Fn = 1127*cos46 = 782.9 N. = Normal force.
March 24, 2014

physics
Circumference = pi*D = 3.14 * 0.7m = 2.20 m. b. Va = 2m/s * 6.28rad/2.20m=5.71 rad/s = Angular velocity.
March 24, 2014

physics
h = (V^2-Vo^2)/2g = (0-(8^2))/-19.6 = 3.27 m.
March 24, 2014

physics
d = 0.5g*t^2 = 20-12 = 8 m. 4.9t^2 = 8 t^2 = 1.63 t = 1.28 s. = Fall time. Range = V*t = 4m/s * 1.28s = 5.12 m. 5.12m > 5 m. Therefore, he will make it.
March 23, 2014

math
Eq1: 5x - y = 20 Eq2: 4x + 3y = 16 Multiply Eq1 by 3 and add the Eqs: 15x - 3y = 60 +4x + 3y = 16 Sum: 19x = 76 X = 4 In Eq1, replace x with 4 and solve for y: 5*4 - y = 20 20-y = 20 Y = 0. Solution: (x,y) = (4,0).
March 23, 2014

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